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Pinch Technology: 기본 이론

Pinch Technology: 기본 이론. Identify Opportunities by Inspection. Stream A. Stream B. 10 C. Process Unit. 150 C. Feed. Product. 100 C. 30 C. Steam. Cooling Water. An opportunity for heat recovery. B. A. Good Idea … or is it?. 150 C. Process Unit. 10 C. Feed. Product. 100 C.

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Pinch Technology: 기본 이론

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  1. Pinch Technology: 기본 이론

  2. Identify Opportunities by Inspection Stream A Stream B 10C Process Unit 150 C Feed Product 100 C 30 C Steam Cooling Water An opportunity for heat recovery

  3. B A Good Idea … or is it? 150 C Process Unit 10 C Feed Product 100 C 30 C Steam Cooling Water Temperature C Heat kW

  4. C One part of the site Another location 10 C 150 C Process Unit Steam Feed Product 100 C 30 C Steam Cooling Water D • A pity ! B A good idea ? Temperature C Temperature C Cooling Water A Heat kW Heat kW Not a good idea any more?

  5. C D A Better Approach But suppose we could have seen the entire picture ! B Temperature C

  6. How can we avoid missing such opportunities? • Especially • On a large site • When we have different departments • No one person has all the knowledge • etc.

  7. AnExample Do we really need 2,040 kW of steam?

  8. Heating and Cooling Duties

  9. The hot composite curve

  10. The cold composite curve

  11. Energy Targets Ahead of Design! QHmin=960kW PINCH Qcmin=120 kW The composite curves

  12. The composite curves show our target (minimum) should be 960 kW of steam We actually use 2040 kW Why?

  13. The closest approach between the composite curves represents the "Pinch".

  14. Divide the process at the Pinch

  15. The feasibility of heat transfer

  16. Therefore if we have ‘A’ kW of cross pinch heat transfer our utility consumption will be: Steam Q HMIN + A Cooling Water QCMIN + A In our example the X pinch heat transfer must be 1080kW

  17. Do not Transfer heat across the Pinch • Do not use hot utility below • Do not recover process heat across • Do not use cold utility above

  18. Pinch Design Principles Divide the process at the pinch

  19. NEW Pinch Design Design now achieves the target of 960 kW steam

  20. SMALLER EXCHANGER AND BOILER PLANT SMALLER EXCHANGER AND COOLING TOWER NEW Pinch Design Design now achieves the target of 960 kW steam

  21. SMALLER EXCHANGER AND BOILER PLANT SMALLER EXCHANGER AND COOLING TOWER NEW Which Design Is Cheaper? To operate - clearly the one with less energy To build? Original Design The more energy efficient design is not necessarily more expensive

  22. Q HOT Q HOT Process / Utility Interface T T Q COLD Q COLD H H Composite Curve Grand Composite Curve

  23. HP Steam HP Steam T MP LP bfw Cooling Water CW H H Simple Process/Utility Interface Alternative Process/Utility Interface Process / Utility Interface

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